Sub-spatial resolution position estimation for optical fibre sensing applications

Darko Zibar, Stefan Werzinger, Bernhard Schmauss

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


Methods from machine learning community are employed for estimating the position of fibre Bragg gratings in an array. Using the conventional methods for position estimation, based on inverse discrete Fourier transform (IDFT), it is required that two-point spatial resolution is less than gratings' spacing. However, we show that by employing statistical inference methods in combination with adaptive gradient algorithm, it is still possible to estimate the grating positions even though this requirement is violated. No prior knowledge of the reflection coefficients is needed as the joint estimation of reflection coefficients and the positions is performed. From the practical point of view, we can demonstrate the reduction of the interrogator's bandwidth by factor of 2. The technique is demonstrated for incoherent optical frequency domain reflectometry (IOFDR). However, the approach is applicable to any other OFDR technique where bandwidth-resolution limitations of IDFT apply.
Original languageEnglish
Title of host publicationProceedings of 16th IEEE SENSORS Conference
Number of pages3
Publication date2017
ISBN (Print)9781509010127
Publication statusPublished - 2017
EventIEEE Sensors Conference 2017 - Scottish Event Campus, Glasgow, United Kingdom
Duration: 30 Oct 20171 Nov 2017


ConferenceIEEE Sensors Conference 2017
LocationScottish Event Campus
Country/TerritoryUnited Kingdom


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